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beta-blockerOne entry found. Main Entry: be·ta–block·er Pronunciation: \-ˌblä-kər\ Function: noun Date: 1968 : any of a class of drugs (as propranolol) that decrease the rate and force of heart contractions and lower high blood pressure by blocking the activity of beta-receptors — be·ta–block·ing \-kiŋ\ adjective
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